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      Summer diet comparison between the American Kestrel (Falco sparverius) and Aplomado Falcon (Falco femoralis) in an agricultural area of Araucanía, southern Chile Translated title: Comparación de la dieta estival del Halconcito Colorado (Falco sparverius) y el Halcón Plomizo (Falco femoralis) en un área agrícola de la Araucanía, sur de Chile

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          Abstract

          The diet of the American Kestrel (Falco sparverius) and Aplomado Falcon (Falco femoralis) was quantified by analysis of their pellets during the summer 1997-1998 in an agricultural area of Araucanía, southern Chile. By number, the most important prey of the American Kestrel were insects (61% of all individual prey) followed by birds (23%), rodents (13.7%) and reptiles (2.6%). Avian prey accounted for the highest biomass contribution (79.6%), followed by rodents (18%). Biomass contribution of insects and reptiles was negligible. Birds were the staple prey of the Aplomado Falcon both by number (89%) and biomass (99%). Number and biomass contribution of rodent and insect prey was minute. Diet of both raptor species did not broadly overlap. Both the American Kestrel and Aplomado Falcon appeared to respond in an opportunistic manner to the most abundant bird prey in the field (Sicalis luteola), although the latter species could be consuming preferentially larger-sized avian prey.

          Translated abstract

          La dieta del Halconcito Colorado (Falco sparverius) y del Halcón Plomizo (Falco femoralis) fue cuantificada a partir de regurgitados durante el verano de 1997-1998 en un área agrícola de la región de la Araucanía, sur de Chile. Numéricamente, las presas más importantes del Halconcito Colorado fueron los insectos (61% del total de presas), seguidos de aves (23%), roedores (13.7%) y reptiles (2.6%). Las aves tuvieron el mayor aporte de biomasa (79.6%), seguidas por los roedores (18%). La contribución de biomasa de insectos y reptiles fue insignificante. Las principales presas del Halcón Plomizo fueron las aves, tanto en número (89%) como en biomasa (99%). La contribución numérica y de biomasa de roedores e insectos fue mínima. La superposición trófica entre ambos halcones fue relativamente baja. Las dos especies parecieron consumir de manera oportunista a la especie de ave más abundante en el campo (Sicalis luteola), aunque el Halcón Plomizo podría estar consumiendo preferentemente a las aves presa de mayor tamaño.

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          Annotated keys for identifying small mammals living in or near Nahuel Huapi National Park or Lanin National Park southern Argentina

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            Food-Niche Relationships among Sympatric Predators: Effects of Level of Prey Identification

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              Biases in Diet Study Methods in the Bonelli's Eagle

              Joan Real (1996)
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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Journal
                hornero
                El hornero
                Hornero
                Aves Argentinas/Asociación Ornitológica del Plata (Ciudad Autónoma de Buenos Aires )
                1850-4884
                December 2004
                : 19
                : 2
                : 53-60
                Article
                S0073-34072004000200002
                aa9f49ba-b8e3-4eae-ac19-998a640db37a

                http://creativecommons.org/licenses/by/4.0/

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                SciELO Argentina

                Self URI (journal page): http://www.scielo.org.ar/scielo.php?script=sci_serial&pid=0073-3407&lng=en
                Categories
                ORNITHOLOGY

                Ornithology
                American Kestrel,Aplomado Falcon,Diet overlap,Falco sparverius,Falco femoralis,Prey size,Sicalis luteola,Southern Chile,Halconcito Colorado,Halcón Plomizo,Sobreposición trófica,Sur de Chile,Tamaño de presa

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